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pthread_rwlockattr_getpshared ()
  • >> pthread_rwlockattr_getpshared (3) ( Solaris man: Библиотечные вызовы )
  • pthread_rwlockattr_getpshared (3) ( FreeBSD man: Библиотечные вызовы )
  • pthread_rwlockattr_getpshared (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get or set process-shared attribute of read-write lock attributes object
     
    

    SYNOPSIS

    cc -mt [ flag... ] file... -lpthread [ library... ]
    #include <pthread.h>
    
    int pthread_rwlockattr_getpshared(
        const pthread_rwlockattr_t *restrict attr,
        int *restrict pshared);
    

    int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
        int pshared);
    

     

    DESCRIPTION

    The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit a read-write lock to be operated upon by any thread that has access to the memory where the read-write lock is allocated, even if the read-write lock is allocated in memory that is shared by multiple processes. If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, the read-write lock will only be operated upon by threads created within the same process as the thread that initialised the read-write lock; if threads of differing processes attempt to operate on such a read-write lock, the behaviour is undefined. The default value of the process-shared attribute is PTHREAD_PROCESS_PRIVATE.

    The pthread_rwlockattr_getpshared() function obtains the value of the process-shared attribute from the initialised attributes object referenced by attr. The pthread_rwlockattr_setpshared() function is used to set the process-shared attribute in an initialised attributes object referenced by attr.  

    RETURN VALUES

    If successful, the pthread_rwlockattr_setpshared() function returns 0. Otherwise, an error number is returned to indicate the error.

    Upon successful completion, the pthread_rwlockattr_getpshared() returns 0 and stores the value of the process-shared attribute of attr into the object referenced by the pshared parameter. Otherwise an error number is returned to indicate the error.  

    ERRORS

    The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() functions will fail if:

    EINVAL

    The value specified by attr or pshared is invalid.

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    pthread_rwlock_init(3C), pthread_rwlock_rdlock(3C), pthread_rwlock_unlock(3C), pthread_rwlock_wrlock(3C), pthread_rwlockattr_init(3C), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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